From ranjithproxy at gmail.com  Mon Feb  8 22:24:33 2010
From: ranjithproxy at gmail.com (ranjith kumar)
Date: Tue, 9 Feb 2010 11:54:33 +0530
Subject: how to see machine code produced by jam
Message-ID: <31cff80d1002082224k176e171coa0adfd7d4c2ea8df@mail.gmail.com>

hi,

1)how to see machine code produced by java virtual machine?
2)Is there any option available to produce machine code(executable)
from java code?
    (so that I can run that executable without running java virtual machine)

3) are java compiler /java virtual machine   doing inter class optimizations?
For example:
class one
{
int fun1()
{
return 1111;
}
}

class two()
{
one ONE;
void  print()
{
int tmp;
tmp=10+(ONE.fun1());
System.out.println("temp=" + temp);
}
}

My question is when machine code is generated for print() function,
will there be a call to ONE.fun1()
or compiler/interpreter  optimizes it to  tmp=10+1111 ????

Thanks in advance.

From forax at univ-mlv.fr  Tue Feb  9 03:29:13 2010
From: forax at univ-mlv.fr (=?ISO-8859-1?Q?R=E9mi_Forax?=)
Date: Tue, 09 Feb 2010 12:29:13 +0100
Subject: how to see machine code produced by jam
In-Reply-To: <31cff80d1002082224k176e171coa0adfd7d4c2ea8df@mail.gmail.com>
References: <31cff80d1002082224k176e171coa0adfd7d4c2ea8df@mail.gmail.com>
Message-ID: <4B714709.5070302@univ-mlv.fr>

Le 09/02/2010 07:24, ranjith kumar a ?crit :
> hi,
>    

These questions are off topic, anyway.

> 1)how to see machine code produced by java virtual machine?
>    

You need a recent jdk7 and download a plugin:
http://wikis.sun.com/display/HotSpotInternals/PrintAssembly#PrintAssembly-PluginImplementations

> 2)Is there any option available to produce machine code(executable)
> from java code?
>      (so that I can run that executable without running java virtual machine)
>
> 3) are java compiler /java virtual machine   doing inter class optimizations?
>    

All desktop VMs does that.

> Thanks in advance.
>    

Remi

From ranjithproxy at gmail.com  Wed Feb 10 04:32:29 2010
From: ranjithproxy at gmail.com (ranjith kumar)
Date: Wed, 10 Feb 2010 18:02:29 +0530
Subject: optimizations done by javac and jvm
Message-ID: <31cff80d1002100432l14a0431q2267c6e58f69d315@mail.gmail.com>

hi
1) where can I find list of optimizations done by javac(java compiler)
and jvm(java virtual machine)
            Any links please.
2) Any class file compiled by javac can be run by kvm(virtual machine
for J2ME technology)??

What my observation is that same .class file run by jvm on x86 is
faster than the run by kvm on x86(with same memory....etc).
What my goal is to move the optimizations done by jvm to javac, so
that optimized .class file is produced and will be run quickly by kvm.

thanks.

From ravenex at qq.com  Sun Feb 21 21:25:19 2010
From: ravenex at qq.com (=?ISO-8859-1?B?cmF2ZW5leA==?=)
Date: Mon, 22 Feb 2010 13:25:19 +0800
Subject: about the compiler-grammar project page
Message-ID: <tencent_6C18ED25632EB86B2ECC8FCF@qq.com>

Hello all,


The compiler-grammar project page (http://openjdk.java.net/projects/compiler-grammar/) says:
> The parser that is currently in the javac compiler is a hand-written LALR parser.
which is not true. The current version of javac is a hand-written recursive descent parser, augmented with operator precedence parsing for binary expressions. I'd like to suggest updating this page to reflect this fact.


Regards,
Raven
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